import logging

logger = logging.getLogger(__name__)

class StorageInterface:
    async def upload_file(self, file_name: str, file_content: bytes, content_type: str | None = None) -> str:
        """Uploads a file and returns its URL."""
        raise NotImplementedError

    async def get_file_url(self, file_name: str) -> str:
        """Gets the URL for a stored file."""
        raise NotImplementedError

class LocalStorage(StorageInterface):
    # This is a very basic placeholder. 
    # In a real scenario, you'd save to a local directory and serve it.
    # For web apps, this usually means a specific static files setup.
    async def upload_file(self, file_name: str, file_content: bytes, content_type: str | None = None) -> str:
        logger.info(f"Simulating upload of {file_name} to local storage.")
        # In a real app, you would save file_content to a path
        # and return a URL that can be used to access it (e.g., /static/uploads/{file_name})
        return f"/static/placeholder_uploads/{file_name}" 

    async def get_file_url(self, file_name: str) -> str:
        return f"/static/placeholder_uploads/{file_name}"

class S3Storage(StorageInterface):
    def __init__(self, bucket_name: str, aws_access_key: str | None, aws_secret_key: str | None, region: str | None):
        self.bucket_name = bucket_name
        # Initialize S3 client (e.g., using boto3)
        # For now, just log
        logger.info(f"S3Storage initialized for bucket: {bucket_name}. (Actual client not implemented)")

    async def upload_file(self, file_name: str, file_content: bytes, content_type: str | None = None) -> str:
        logger.info(f"Simulating upload of {file_name} to S3 bucket {self.bucket_name}.")
        # Real S3 upload logic here
        return f"https://{self.bucket_name}.s3.amazonaws.com/{file_name}" # Example URL

    async def get_file_url(self, file_name: str) -> str:
        return f"https://{self.bucket_name}.s3.amazonaws.com/{file_name}"

# Factory or configuration can decide which storage to use
# from app.core.config import settings
# if settings.USE_S3_STORAGE:
#     storage_client = S3Storage(...)
# else:
#     storage_client = LocalStorage()

# For now, let's default to a placeholder local storage
storage_client = LocalStorage()
